<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col
          ><el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          ></el-col
        >
      </el-row>
      <!-- 表格 -->
      <tree-table
        class="treeTable"
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="序列"
        border
        :show-row-hover="false"
      >
        <!-- 是否有效 -->
        <template solt="isok" v-slot:isok="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen;"
          ></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>
        <!-- 排序 -->
        <template solt="order" v-slot:order="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            size="mini"
            type="success"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template solt="opt" v-slot:opt="">
          <el-button type="primary" icon="el-icon-edit" size="mini"
            >编辑</el-button
          >
          <el-button type="danger" icon="el-icon-delete" size="mini"
            >删除</el-button
          >
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <!-- options用来指定数据源 -->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            expand-trigger="hover"
            @change="parentCateChanged"
            clearable
            ref="elcascaderRefs"
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 查寻条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表，默认为空
      catelist: [],
      total: 0,
      // 为table制定列定义
      columns: [
        { label: '分类名称', prop: 'cat_name' },
        { label: '是否有效', type: 'template', template: 'isok' },
        { label: '排序', type: 'template', template: 'order' },
        { label: '操作', type: 'template', template: 'opt' }
      ],
      // 控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      // 添加分类的表单数据对象
      addCateForm: {
        cat_name: '',
        // 父级分类id
        cat_pid: 0,
        // 分类登记 默认一级分类
        cat_level: 0
      },
      // 添加分类表单验证规则对象
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      // 父级分类列表
      parentCateList: [],
      // 制定级别选择器配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类的id数组
      selectedKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.querInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('失败率')
      }
      // 把数据列表赋值给catelist
      this.catelist = res.data.result
      // 为总数据条数赋值
      this.total = res.data.total
    },
    // 监听pagesize改变事件
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum改变
    handleCurrentChange(newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击添加显示对话框
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('失败')
      }
      this.parentCateList = res.data
    },
    // 选择发生变化
    parentCateChanged() {
      console.log(this.selectedKeys)
      this.$refs.elcascaderRefs.dropDownVisible = false
      // 如果selectedKeys大于0说明选中父级分类 反之没有
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ]
        this.addCateForm.cat_level = this.selectedKeys.length
        return false
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮添加新分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error('失败')
        }
        this.$message.success('成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听对话框的关闭事件
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
</style>
